Correlation between magnetic and transport properties of phase-separated La0.5Ca0.5MnO3

被引：5

作者：

Sacanell, J

Levy, P

Ghivelder, L

Polla, G

Parisi, F

机构：

[1] Comis Nacl Energia Atom, Dept Fis, Unidad Actividad Fis, Entro Atom Contituyentes, RA-1650 San Martin, Buenos Aires, Argentina

[2] Univ Fed Rio de Janeiro, Inst Fis, BR-21945970 Rio De Janeiro, Brazil

来源：

PHYSICA B-CONDENSED MATTER | 2002年 / 320卷 / 1-4期

关键词：

manganites; phase separation; colossal magnetoresistance;

D O I：

10.1016/S0921-4526(02)00650-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The effect of low-magnetic fields on the magnetic and electrical transport properties of polycrystalline samples of the phase-separated compound La0.5Ca0.5MnO3 is Studied. The results are interpreted in the framework of the field-induced ferromagnetic fraction enlargement mechanism. A fraction expansion coefficient alpha(f), which relates the ferromagnetic fraction f with the applied field H, was obtained. A phenomenological model to understand the enlargement mechanism is worked out. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：90 / 93

页数：4

共 5 条

[1] Controlled phase separation in La0.5Ca0.5MnO3 [J].

Levy, P ;

Parisi, F ;

Polla, G ;

Vega, D ;

Leyva, G ;

Lanza, H ;

Freitas, RS ;

Ghivelder, L .

PHYSICAL REVIEW B, 2000, 62 (10) :6437-6441

[2] Resistivity of mixed-phase manganites [J].

Mayr, M ;

Moreo, A ;

Vergés, JA ;

Arispe, J ;

Feiguin, A ;

Dagotto, E .

PHYSICAL REVIEW LETTERS, 2001, 86 (01) :135-138

[3] AN EQUATION FOR THE CONDUCTIVITY OF BINARY-MIXTURES WITH ANISOTROPIC GRAIN STRUCTURES [J].

MCLACHLAN, DS .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1987, 20 (07) :865-877

[4] Magnetoresistance induced by low-field control of phase separation in La0.5Ca0.5MnO3 -: art. no. 144419 [J].

Parisi, F ;

Levy, P ;

Ghivelder, L ;

Polla, G ;

Vega, D .

PHYSICAL REVIEW B, 2001, 63 (14)

[5] Percolative phase separation underlies colossal magnetoresistance in mixed-valent manganites [J].

Uehara, M ;

Mori, S ;

Chen, CH ;

Cheong, SW .

NATURE, 1999, 399 (6736) :560-563

← 1 →